今天安裝openstack folsom版本，安裝完mysql，為各個服務增加對應的數據庫和用戶后，發現 
無法使用新增的用戶登陸mysql。我增加用戶的方法如下： 
mysql -uroot -p$MYSQL_PASS <<EOF 
CREATE DATABASE nova; 
GRANT ALL PRIVILEGES ON nova.* TO 'nova'@'%' IDENTIFIED BY '$MYSQL_PASS'; 
CREATE DATABASE glance; 
GRANT ALL PRIVILEGES ON glance.* TO 'glance'@'%' IDENTIFIED BY '$MYSQL_PASS'; 
CREATE DATABASE keystone; 
GRANT ALL PRIVILEGES ON keystone.* TO 'keystone'@'%'IDENTIFIED BY '$MYSQL_PASS'; 
CREATE DATABASE cinder; 
GRANT ALL PRIVILEGES ON cinder.* TO 'cinder'@'%'IDENTIFIED BY '$MYSQL_PASS'; 
CREATE DATABASE quantum; 
GRANT ALL PRIVILEGES ON quantum.* TO 'quantum'@'%'IDENTIFIED BY '$MYSQL_PASS'; 
FLUSH PRIVILEGES; 
EOF 
但使用用戶登陸失敗： 
root@controller:~# mysql -h localhost -ukeystone -ppassword 
ERROR 1045 (28000): Access denied for user 'keystone'@'localhost' (using password: YES) 
解決方法： 
增加普通用戶后，執行： 
mysql> use mysql 
mysql> delete from user where user=''; 
mysql> flush privileges; 
意思是刪除匿名用戶。 
OK，搞定，enjoy！